Year	Percent
1950	15.14403
1955	16.33706
1960	17.10786
1965	17.55793
1970	16.86076
1975	15.58741
1980	12.60192
1985	11.94018
1990	11.69941
1995	12.26898
2000	12.22558
2005	12.35438
2010	12.34109
2015	12.51912
2020	13.12615
2025	14.27514
2030	15.58865
2035	16.73842
2040	17.65433
2045	18.31175
2050	19.13952
2055	20.13363
2060	21.13473
2065	21.97244
2070	22.48546
2075	22.82151
2080	23.21536
2085	23.693
2090	24.21087
2095	24.64301
2100	24.94794